Fuel-feed pump for internal-combustion engines



March 2 1926.

R. WALKER FUEL FEED PUMP FOR INTERNAL COMBUSTIONNGINES Filed Jan. 2.5.1924 m Ezgi a a? 2 ?V Patented Mar. 2, 1926.

'PATENT o'FF c E r RUDOLF WAIKER, VIENNA, AUSTRIA.

FUEI-FEED PUMP FOR INTERNAI-COMBUSTION ENGINES.

Application filed. January 25, 1924. Serial No; &88,526.

To all 'whom 'it may conccm: i

Be it known that I, RUDOLF WALKER, a subject of the Kingdom of GreatBritain, residing at XI Simmeringer Hauptstrasse 38-40, Vienna, Austria,have invented Improvements in Fuel-Feed Pumps for Internal-CombustionEngines, of which the follojwing is a specification.

Ina modification of the improved fuel pump according to thepresentinvention the springless suction valve mounted on the piston ot'the fuel pump is opened 'and ,closed quickly by its inertia which actsat every reversal ot the stroke of the fast-moving piston, and iscarried along by the pump pis-- ton in its open and closed conditionsrespectively. These movements of the valve may be accelerated by the useof hydraulic resistance. rendered accessible from a pump cylinder. i

A constructional example of the improved uel pump is illustrated in theaccompanying drawings in which p i v Fgure 1 is a longitudinalsection,and

point outside the Figure 2 is a sectional view of a details of theimproved pump.

1 is the pump cylinder; 2 is the pump piston; and 3 isthe suction valvemounted on the piston 2. The suction valve rod 9 eX- tends throughoutthe length of the suction duct 17 in the piston 2 down to a laterallyaccessible opening 14 formed in the piston,

where the rod 9 carries a preferably ad-` justable stop 11 for limitingthe lift of the suction valve 3.

The suction valve 3 has complete freedom of movement within its strokewhich is limi ited by the` stop 11, and it is opened and closed quicklyand independently of the flow of the liquid through it, by thearrangement that on the reversal of the fast-moving v piston 2, thesuction valve 3, owng to its own inertia, does not reverse its movementimmediately but continues to move in the same direction as hitherto, sofar as this is allowed by the stop 11. From that moment onwards thesuction .valve is carred along by the piston in its respective conditionof being open or closed.

The inertia of the suction valve and consequently the rapidity withwhich it opens and closes increases With the speed of the puinp and theweight of the suction yalve. Although the suction valve s necessarly ofFurther, the suction valve is small size, its Weight is brought up tothe required amount by the provision of a long valve rod 9. i

This valverod also serves to afi'ord aci the pump oylpreferablyadjustable, stop 11.' If the openin 1 1 n the piston issituated entirelyoutsi e the pump cylinder 1 no opening in the latter is necessary.

v Further, in the illustrated example the opening in the piston and inthe cylinder is Situated within the fuel tank 13.

Through these openings it is possible to inspect, operate and test .thesuction valve 3 by means of thevalve rod 9 and observeand regulate thelift of the suction valve. Moreover the stop 11 works in liquid fue'l,so that it providesthe suction valve with a hydraulic resistance,whichacts uponthe suction valve in the movement of the piston, wherebythe. suction valve isi causedto open and. close' more quickly than wouldbe the case without 'this hydraulic resistance.--

By mounting a plate 18 or the like device on the suction-valve rod9(Fig. 2), this hydraulic resistance can be' increased with' the resultthat` the suction valve will open' and close still more quickly. u i 15is a larger stage of the piston 2, which operates as a preliminary stagein an auxiliary pumping cylinder 16 and is acted upon 4 by a spring 8,that produces a quick upstroke of the piston 2, whilst the downstroke of,the latter, is efi'ected by a cam (notshown). i v y The suction duet 17is closed atitslower' end at 20; it communicates only by way of theducts 19 with thev auxiliary pumping space 16 which communicates in itsturn` withthe tank 13 through a separate suction: valve 21 (shown as afiap valve). V

The operation of the large piston stage 15 (Fig. 1 is as follows:-During the upstroke of the piston, this stage 15 draws liquidfuelthrough 21 from the tank 13, and forces it, during the downstroke of thepiston, through the ducts 19 into the suction duct 17 of the piston 2,and thence into the pumping space above the suction valve 3.

Owing to the closures at 20 and 21 the described Construction assuresasuotion and: compression of" the" auxiliaryl' pumpf 15', 16` withoutloss; and consequently .a complete filling of the suetion space of theimproved fuel pump even at very high' speeds;

The auxiliary pump may also deliver en excess of liqud f'uel to tliesueton valve 3 and in such a ease the-deliyery valv-e 4: can beprevented from opening by various means;

1. In a liq uid fuel pump for internal conibustion engmesg a prmppistong asueti'o'n valve on seid-'pisten having' complete freedom ofmovement within its limited stroke-, said velve` being: of suchweighta's to be caused to open' and close quickly by the action-of its large'inertie' at eaeh reversl of the stroke of `'thefatst movin'g; pisten andbeing v erried alongyn- 'its` openendclosed positions respeetivelm e v xv 2. In a liqiid fue-l' punp for internal eon'ibustion'- engines, as*pup pisten, a suetion valve on said piston,-.- a seat' and a" stop' for`said vlvey said va lve beingof su'oh weight a's to be caused` to; openand close quickly by the action-of itsinettia a't each'- reversahofthestreh of the fastn'ovin'g pisten and being; carried along) in" its? openand' closed postions respective-ly: and a rool' oa rried by the vlveinerwsing it's Weight and nertia': r

bebe-used* to open and close quickly by the' action of its inertia; att'ea'ehrevets'al of the' stroke of' the r fest moving: pisten' and beingearried along in it's open end closed positi'ons respeetvely, a ro'd'cermied by 'a'd infcreasing the' wei-ght 'of the valveandextendbustion: engines a pump pisten; a suet'eri said valve being causedto open anel close quickly by the' action of its" inerti &tt each nd'elose'd positions r' adapted, When containing liquid fuel, tosubmergethe stop theren-Whereby to producea" hydrmlic resistizn ce' tothe movement of the rod and VLlVG and thereby cause rapid opening andclosngmovements of the latter' at the' 'ever'sl' 'of the Strokes of saidpisten. i L u i 6. A fuel pump as claimed in claim 4 cheracterzed bythe' provson of 1 container adapted, When containing liquid fuel tosubmerge the* stop` theren" Wherebyto produee :t hydraulie resstance tothe movement of the rod an'd valve and there'by cause rapid' opening andelosing movements ot theulatter at the' reversa'ls' of the strokesofsaid pisten.

?Libfuel pump as claimed in claim 3 eharacterized by the p'ov-si'o'n ofa containe' adapted; When eontttin'ng lio uid fuel, to submerge tliestoptherein- Whereby toproduce a liydraulie resistanee to` the movementof the rod and valve' and thereby cause' rapid opening' and' closingmovements' of the latter at the reversals of tlie'str'okes of saidpisten', and m'eans'to 'increase the hyduulie resistanee above thata'l'orde'd by the stop.

A fuelpump as' claimed in claim' l charactei'zed by the provson of a,con tainer adapted When containing lquid' fuel, to subme'rge the stoptheren whereby to produce a hydraulie resstance to the'movement of the'red and valve and-thereby cause i I v rapid opening' and cl'osingmovements of 3z-II`1 a liqu id ,fuel ipuinp for internal 7 combustion'engiiies,':-2t pump pisten;- a; suo-' tioi' valve on saidgpistoh aseatfor sid valve, said valve bilg of such weight as' to the letter atthe reverse-le' of the strokes ot seid-pisten; andmeansto increasetheliydraulie resistano'e above' that afiorded by the stop. V

9.' A fuel p'ump as" clime'din claim 1 chwrcterized by the provsion ofen enlar'gement at one end of the pist'on,` a cylinder reeeivin g thepisten;` and havingan enlarged portion re'eeivn g* the' enlarged portionof the piston; said pist'on having-e longitu'dinal bore to'condnetfu'el'to the suetion valve and communcat'ng Wltli the* enlarged portionof the oylinder, the enlarged portion of said pisten be'ng zrdapted' toforce 'lqud'fuel into the b'ore ott'le* pisten, and` valve controlledmeans ad'nitting liquid fuel to the enla'rged portion' of the'cylin'der.

'lOL A fuel pu mp as claimed in claim 2 chti 'c-terized by thepr'ovision of an enlergeme'nt at one end ot the' piston', a cylinderreceiving 'tle pstor and having an en large@ portion receiving theenlrged portion of the pisten; seid'piston having a' longitudnal boreto-eonduet fuel tothe suctio'n" valve' and communioating With the enlargd portion of the cylnder, the enla'rged portion of said piton being'edapted to=force li'q-uid- 'fuelinto"` the boreofthe piton, and v lv*controlledmeans zfdinit'ting liquid fuel to the 'enlrged" portion of thec'y-linder.

l-1 A feel pu'mp as claimedin' claim 3 eharaeter'z'ed by the p'rovisionof an enlargement at one end of the pisten, a cylinder said piston beingadapted to force lqud fuel recevng the pston and having an enlarged intothe bore of the pisten, and valve conporton recevng the enlarged portionof trolled means admittng lqud fuel to the 10 the piston, said pstonhaving a longtudnal enlarged portion of the cylinder.

5 bore to conduct fuel to the suction valve In Wtness WhereofIhaVehereunto signed and communcatng With the enlarged pormy name. tion ofthe cylnder, the enlarged portion of RUDOLF WALKER.

